20263881 has 32 divisors (see below), whose sum is σ = 32006016. Its totient is φ = 11264000.

The previous prime is 20263871. The next prime is 20263889. The reversal of 20263881 is 18836202.

It is not a de Polignac number, because 20263881 - 2⁵ = 20263849 is a prime.

It is a super-2 number, since 2×20263881² = 821249746364322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20263889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22561 + ... + 23441.

It is an arithmetic number, because the mean of its divisors is an integer number (1000188).

Almost surely, 2^20263881 is an apocalyptic number.

It is an amenable number.

20263881 is a deficient number, since it is larger than the sum of its proper divisors (11742135).

20263881 is a wasteful number, since it uses less digits than its factorization.

20263881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 20263881 is about 4501.5420691136. The cubic root of 20263881 is about 272.6303548254.

It can be divided in two parts, 20 and 263881, that added together give a triangular number (263901 = T₇₂₆).

The spelling of 20263881 in words is "twenty million, two hundred sixty-three thousand, eight hundred eighty-one".